DFRobot Ring Inductive Proximity Sensor (8mm hole diameter) is designed to detect metal objects entering or passing through the ring. This sensor features less than 1ms response time, high accuracy, and stable performance that can detect fast-moving small metal objects. The proximity sensor operates from 6V to 36V power supply range, withstand -25°C to 65°C temperature range, support IP66 protection degree, and offer NPN output. This sensor comes with an onboard LED for indicating detection status, a sensitivity adjustment knob, and is available in 68mm x 39mm x 20mm dimensions. The proximity sensor is ideal for sensing small metal parts such as screws, washers, nuts, and monitoring wire breakages and jams.